| 1 |
/* Copyright (c) 1994 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Convert a Wavefront .obj file to Radiance format. |
| 9 |
* |
| 10 |
* Currently, we support only polygonal geometry, and faces |
| 11 |
* must be either quads or triangles for smoothing to work. |
| 12 |
* Also, texture indices only work for triangles, though |
| 13 |
* I'm not sure they work correctly. |
| 14 |
*/ |
| 15 |
|
| 16 |
#include "standard.h" |
| 17 |
|
| 18 |
#include <ctype.h> |
| 19 |
|
| 20 |
#define VOIDID "void" /* this is defined in object.h */ |
| 21 |
|
| 22 |
#define TCALNAME "tmesh.cal" /* triangle interp. file */ |
| 23 |
#define QCALNAME "surf.cal" /* quad interp. file */ |
| 24 |
#define PATNAME "M-pat" /* mesh pattern name (reused) */ |
| 25 |
#define TEXNAME "M-nor" /* mesh texture name (reused) */ |
| 26 |
|
| 27 |
#define ABS(x) ((x)>=0 ? (x) : -(x)) |
| 28 |
|
| 29 |
#define pvect(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
| 30 |
|
| 31 |
FVECT *vlist; /* our vertex list */ |
| 32 |
int nvs; /* number of vertices in our list */ |
| 33 |
FVECT *vnlist; /* vertex normal list */ |
| 34 |
int nvns; |
| 35 |
FLOAT (*vtlist)[2]; /* texture vertex list */ |
| 36 |
int nvts; |
| 37 |
|
| 38 |
typedef FLOAT BARYCCM[3][4]; /* barycentric coordinate system */ |
| 39 |
|
| 40 |
typedef int VNDX[3]; /* vertex index (point,texture,normal) */ |
| 41 |
|
| 42 |
#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
| 43 |
|
| 44 |
#define MAXARG 64 /* maximum # arguments in a statement */ |
| 45 |
|
| 46 |
char *defmat = VOIDID; /* default (starting) material name */ |
| 47 |
char *defpat = ""; /* default (starting) picture name */ |
| 48 |
char *defobj = "F"; /* default (starting) object name */ |
| 49 |
|
| 50 |
char picfile[128]; /* current picture file */ |
| 51 |
char matname[64]; /* current material name */ |
| 52 |
char objname[128]; /* current object name */ |
| 53 |
int lineno; /* current line number */ |
| 54 |
|
| 55 |
int nfaces; /* total number of faces output */ |
| 56 |
|
| 57 |
|
| 58 |
main(argc, argv) /* read in T-mesh files and convert */ |
| 59 |
int argc; |
| 60 |
char *argv[]; |
| 61 |
{ |
| 62 |
FILE *fp; |
| 63 |
int i; |
| 64 |
|
| 65 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
| 66 |
switch (argv[i][1]) { |
| 67 |
case 'o': /* object name */ |
| 68 |
defobj = argv[++i]; |
| 69 |
break; |
| 70 |
case 'm': /* default material */ |
| 71 |
defmat = argv[++i]; |
| 72 |
break; |
| 73 |
case 'p': /* default picture */ |
| 74 |
defpat = argv[++i]; |
| 75 |
break; |
| 76 |
default: |
| 77 |
fprintf(stderr, |
| 78 |
"Usage: %s [-o obj][-m mat][-p pic] [file ..]\n", |
| 79 |
argv[0]); |
| 80 |
exit(1); |
| 81 |
} |
| 82 |
if (i >= argc) |
| 83 |
convert("<stdin>", stdin); |
| 84 |
else |
| 85 |
for ( ; i < argc; i++) { |
| 86 |
if ((fp = fopen(argv[i], "r")) == NULL) { |
| 87 |
perror(argv[i]); |
| 88 |
exit(1); |
| 89 |
} |
| 90 |
convert(argv[i], fp); |
| 91 |
fclose(fp); |
| 92 |
} |
| 93 |
exit(0); |
| 94 |
} |
| 95 |
|
| 96 |
|
| 97 |
convert(fname, fp) /* convert a T-mesh */ |
| 98 |
char *fname; |
| 99 |
FILE *fp; |
| 100 |
{ |
| 101 |
char *argv[MAXARG]; |
| 102 |
int argc; |
| 103 |
int nstats, nunknown; |
| 104 |
register int i; |
| 105 |
/* start fresh */ |
| 106 |
freeverts(); |
| 107 |
strcpy(picfile, defpat); |
| 108 |
strcpy(matname, defmat); |
| 109 |
strcpy(objname, defobj); |
| 110 |
lineno = 0; |
| 111 |
nstats = nunknown = 0; |
| 112 |
|
| 113 |
printf("\n# Wavefront file read from: %s\n", fname); |
| 114 |
/* scan until EOF */ |
| 115 |
while (argc = getstmt(argv, fp)) { |
| 116 |
switch (argv[0][0]) { |
| 117 |
case 'v': /* vertex */ |
| 118 |
switch (argv[0][1]) { |
| 119 |
case '\0': /* point */ |
| 120 |
if (badarg(argc-1,argv+1,"fff")) |
| 121 |
syntax(fname, lineno, "Bad vertex"); |
| 122 |
newv(atof(argv[1]), atof(argv[2]), |
| 123 |
atof(argv[3])); |
| 124 |
break; |
| 125 |
case 'n': /* normal */ |
| 126 |
if (argv[0][2]) |
| 127 |
goto unknown; |
| 128 |
if (badarg(argc-1,argv+1,"fff")) |
| 129 |
syntax(fname, lineno, "Bad normal"); |
| 130 |
if (!newvn(atof(argv[1]), atof(argv[2]), |
| 131 |
atof(argv[3]))) |
| 132 |
syntax(fname, lineno, "Zero normal"); |
| 133 |
break; |
| 134 |
case 't': /* texture */ |
| 135 |
if (argv[0][2]) |
| 136 |
goto unknown; |
| 137 |
if (badarg(argc-1,argv+1,"ff")) |
| 138 |
goto unknown; |
| 139 |
newvt(atof(argv[1]), atof(argv[2])); |
| 140 |
break; |
| 141 |
default: |
| 142 |
goto unknown; |
| 143 |
} |
| 144 |
break; |
| 145 |
case 'f': /* face */ |
| 146 |
if (argv[0][1]) |
| 147 |
goto unknown; |
| 148 |
switch (argc-1) { |
| 149 |
case 0: case 1: case 2: |
| 150 |
syntax(fname, lineno, "Too few vertices"); |
| 151 |
break; |
| 152 |
case 3: |
| 153 |
if (!puttri(argv[1], argv[2], argv[3])) |
| 154 |
syntax(fname, lineno, "Bad triangle"); |
| 155 |
break; |
| 156 |
case 4: |
| 157 |
if (!putquad(argv[1], argv[2], |
| 158 |
argv[3], argv[4])) |
| 159 |
syntax(fname, lineno, "Bad quad"); |
| 160 |
break; |
| 161 |
default: |
| 162 |
if (!putface(argc-1, argv+1)) |
| 163 |
syntax(fname, lineno, "Bad face"); |
| 164 |
break; |
| 165 |
} |
| 166 |
break; |
| 167 |
case 'u': |
| 168 |
if (!strcmp(argv[0], "usemtl")) { /* material */ |
| 169 |
if (argc < 2) |
| 170 |
break; /* not fatal */ |
| 171 |
strcpy(matname, argv[1]); |
| 172 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
| 173 |
if (argc < 2) |
| 174 |
break; /* not fatal */ |
| 175 |
if (!strcmp(argv[1], "off")) |
| 176 |
picfile[0] = '\0'; |
| 177 |
else |
| 178 |
strcpy(picfile, argv[1]); |
| 179 |
} else |
| 180 |
goto unknown; |
| 181 |
break; |
| 182 |
case 'o': /* object name */ |
| 183 |
if (argv[0][1]) |
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goto unknown; |
| 185 |
if (argc < 2) |
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break; /* not fatal */ |
| 187 |
strcpy(objname, argv[1]); |
| 188 |
break; |
| 189 |
case 'g': /* group name(s) */ |
| 190 |
if (argv[0][1]) |
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goto unknown; |
| 192 |
if (argc < 2) |
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break; /* not fatal */ |
| 194 |
objname[0] = '\0'; |
| 195 |
for (i = 1; i < argc; i++) |
| 196 |
if (objname[0]) |
| 197 |
sprintf(objname+strlen(objname), |
| 198 |
".%s", argv[i]); |
| 199 |
else |
| 200 |
strcpy(objname, argv[i]); |
| 201 |
break; |
| 202 |
case '#': /* comment */ |
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break; |
| 204 |
default:; /* something we don't deal with */ |
| 205 |
unknown: |
| 206 |
nunknown++; |
| 207 |
break; |
| 208 |
} |
| 209 |
nstats++; |
| 210 |
} |
| 211 |
printf("# Done processing file: %s\n", fname); |
| 212 |
printf("# %d lines, %d statements, %d unrecognized\n", |
| 213 |
lineno, nstats, nunknown); |
| 214 |
} |
| 215 |
|
| 216 |
|
| 217 |
int |
| 218 |
getstmt(av, fp) /* read the next statement from fp */ |
| 219 |
register char *av[MAXARG]; |
| 220 |
FILE *fp; |
| 221 |
{ |
| 222 |
extern char *fgetline(); |
| 223 |
static char sbuf[MAXARG*10]; |
| 224 |
register char *cp; |
| 225 |
register int i; |
| 226 |
|
| 227 |
do { |
| 228 |
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
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return(0); |
| 230 |
i = 0; |
| 231 |
for ( ; ; ) { |
| 232 |
while (isspace(*cp) || *cp == '\\') { |
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if (*cp == '\n') |
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lineno++; |
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*cp++ = '\0'; |
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} |
| 237 |
if (!*cp || i >= MAXARG-1) |
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break; |
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av[i++] = cp; |
| 240 |
while (*++cp && !isspace(*cp)) |
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; |
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} |
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av[i] = NULL; |
| 244 |
lineno++; |
| 245 |
} while (!i); |
| 246 |
|
| 247 |
return(i); |
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} |
| 249 |
|
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|
| 251 |
cvtndx(vi, vs) /* convert vertex string to index */ |
| 252 |
register VNDX vi; |
| 253 |
register char *vs; |
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{ |
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/* get point */ |
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vi[0] = atoi(vs); |
| 257 |
if (vi[0] > 0) { |
| 258 |
if (vi[0]-- > nvs) |
| 259 |
return(0); |
| 260 |
} else if (vi[0] < 0) { |
| 261 |
vi[0] = nvs + vi[0]; |
| 262 |
if (vi[0] < 0) |
| 263 |
return(0); |
| 264 |
} else |
| 265 |
return(0); |
| 266 |
/* get texture */ |
| 267 |
while (*vs) |
| 268 |
if (*vs++ == '/') |
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break; |
| 270 |
vi[1] = atoi(vs); |
| 271 |
if (vi[1] > 0) { |
| 272 |
if (vi[1]-- > nvts) |
| 273 |
return(0); |
| 274 |
} else if (vi[1] < 0) { |
| 275 |
vi[1] = nvts + vi[1]; |
| 276 |
if (vi[1] < 0) |
| 277 |
return(0); |
| 278 |
} else |
| 279 |
vi[1] = -1; |
| 280 |
/* get normal */ |
| 281 |
while (*vs) |
| 282 |
if (*vs++ == '/') |
| 283 |
break; |
| 284 |
vi[2] = atoi(vs); |
| 285 |
if (vi[2] > 0) { |
| 286 |
if (vi[2]-- > nvns) |
| 287 |
return(0); |
| 288 |
} else if (vi[2] < 0) { |
| 289 |
vi[2] = nvns + vi[2]; |
| 290 |
if (vi[2] < 0) |
| 291 |
return(0); |
| 292 |
} else |
| 293 |
vi[2] = -1; |
| 294 |
return(1); |
| 295 |
} |
| 296 |
|
| 297 |
|
| 298 |
putface(ac, av) /* put out an N-sided polygon */ |
| 299 |
register int ac; |
| 300 |
register char **av; |
| 301 |
{ |
| 302 |
VNDX vi; |
| 303 |
|
| 304 |
printf("\n%s polygon %s.%d\n", matname, objname, ++nfaces); |
| 305 |
printf("0\n0\n%d\n", 3*ac); |
| 306 |
while (ac--) { |
| 307 |
if (!cvtndx(vi, *av++)) |
| 308 |
return(0); |
| 309 |
pvect(vlist[vi[0]]); |
| 310 |
} |
| 311 |
return(1); |
| 312 |
} |
| 313 |
|
| 314 |
|
| 315 |
puttri(v1, v2, v3) /* put out a triangle */ |
| 316 |
char *v1, *v2, *v3; |
| 317 |
{ |
| 318 |
char *mod = matname; |
| 319 |
VNDX v1i, v2i, v3i; |
| 320 |
BARYCCM bvecs; |
| 321 |
|
| 322 |
if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
| 323 |
return(0); |
| 324 |
/* compute barycentric coordinates */ |
| 325 |
if ((v1i[2]>=0&&v2i[2]>=0&&v3i[2]>=0) || |
| 326 |
(v1i[1]>=0&&v2i[1]>=0&&v3i[1]>=0)) |
| 327 |
if (comp_baryc(bvecs, vlist[v1i[0]], vlist[v2i[0]], |
| 328 |
vlist[v3i[0]]) < 0) |
| 329 |
return(0); |
| 330 |
/* put out texture (if any) */ |
| 331 |
if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) { |
| 332 |
printf("\n%s texfunc %s\n", mod, TEXNAME); |
| 333 |
mod = TEXNAME; |
| 334 |
printf("4 dx dy dz %s\n", TCALNAME); |
| 335 |
printf("0\n21\n"); |
| 336 |
put_baryc(bvecs); |
| 337 |
printf("\t%14.12g %14.12g %14.12g\n", |
| 338 |
vnlist[v1i[2]][0], vnlist[v2i[2]][0], |
| 339 |
vnlist[v3i[2]][0]); |
| 340 |
printf("\t%14.12g %14.12g %14.12g\n", |
| 341 |
vnlist[v1i[2]][1], vnlist[v2i[2]][1], |
| 342 |
vnlist[v3i[2]][1]); |
| 343 |
printf("\t%14.12g %14.12g %14.12g\n", |
| 344 |
vnlist[v1i[2]][2], vnlist[v2i[2]][2], |
| 345 |
vnlist[v3i[2]][2]); |
| 346 |
} |
| 347 |
/* put out pattern (if any) */ |
| 348 |
if (picfile[0] && v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0) { |
| 349 |
printf("\n%s colorpict %s\n", mod, PATNAME); |
| 350 |
mod = PATNAME; |
| 351 |
printf("7 noneg noneg noneg %s %s u v\n", picfile, TCALNAME); |
| 352 |
printf("0\n18\n"); |
| 353 |
put_baryc(bvecs); |
| 354 |
printf("\t%f %f %f\n", vtlist[v1i[1]][0], |
| 355 |
vtlist[v2i[1]][0], vtlist[v3i[1]][0]); |
| 356 |
printf("\t%f %f %f\n", vtlist[v1i[1]][1], |
| 357 |
vtlist[v2i[1]][1], vtlist[v3i[1]][1]); |
| 358 |
} |
| 359 |
/* put out triangle */ |
| 360 |
printf("\n%s polygon %s.%d\n", matname, objname, ++nfaces); |
| 361 |
printf("0\n0\n9\n"); |
| 362 |
pvect(vlist[v1i[0]]); |
| 363 |
pvect(vlist[v2i[0]]); |
| 364 |
pvect(vlist[v3i[0]]); |
| 365 |
|
| 366 |
return(1); |
| 367 |
} |
| 368 |
|
| 369 |
|
| 370 |
int |
| 371 |
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
| 372 |
register BARYCCM bcm; |
| 373 |
FLOAT *v1, *v2, *v3; |
| 374 |
{ |
| 375 |
FLOAT *vt; |
| 376 |
FVECT va, vab, vcb; |
| 377 |
double d; |
| 378 |
register int i, j; |
| 379 |
|
| 380 |
for (j = 0; j < 3; j++) { |
| 381 |
for (i = 0; i < 3; i++) { |
| 382 |
vab[i] = v1[i] - v2[i]; |
| 383 |
vcb[i] = v3[i] - v2[i]; |
| 384 |
} |
| 385 |
d = DOT(vcb,vcb); |
| 386 |
if (d <= FTINY) |
| 387 |
return(-1); |
| 388 |
d = DOT(vcb,vab)/d; |
| 389 |
for (i = 0; i < 3; i++) |
| 390 |
va[i] = vab[i] - vcb[i]*d; |
| 391 |
d = DOT(va,va); |
| 392 |
if (d <= FTINY) |
| 393 |
return(-1); |
| 394 |
for (i = 0; i < 3; i++) { |
| 395 |
va[i] /= d; |
| 396 |
bcm[j][i] = va[i]; |
| 397 |
} |
| 398 |
bcm[j][3] = -DOT(v2,va); |
| 399 |
/* rotate vertices */ |
| 400 |
vt = v1; |
| 401 |
v1 = v2; |
| 402 |
v2 = v3; |
| 403 |
v3 = vt; |
| 404 |
} |
| 405 |
return(0); |
| 406 |
} |
| 407 |
|
| 408 |
|
| 409 |
put_baryc(bcm) /* put barycentric coord. vectors */ |
| 410 |
register BARYCCM bcm; |
| 411 |
{ |
| 412 |
register int i; |
| 413 |
|
| 414 |
for (i = 0; i < 3; i++) |
| 415 |
printf("%14.8f %14.8f %14.8f %14.8f\n", |
| 416 |
bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
| 417 |
} |
| 418 |
|
| 419 |
|
| 420 |
putquad(p0, p1, p2, p3) /* put out a quadrilateral */ |
| 421 |
char *p0, *p1, *p2, *p3; |
| 422 |
{ |
| 423 |
VNDX p0i, p1i, p2i, p3i; |
| 424 |
FVECT norm[4]; |
| 425 |
int axis; |
| 426 |
FVECT v1, v2, vc1, vc2; |
| 427 |
int ok1, ok2; |
| 428 |
/* get actual indices */ |
| 429 |
if (!cvtndx(p0i,p0) || !cvtndx(p1i,p1) || |
| 430 |
!cvtndx(p2i,p2) || !cvtndx(p3i,p3)) |
| 431 |
return(0); |
| 432 |
/* compute exact normals */ |
| 433 |
fvsum(v1, vlist[p1i[0]], vlist[p0i[0]], -1.0); |
| 434 |
fvsum(v2, vlist[p2i[0]], vlist[p0i[0]], -1.0); |
| 435 |
fcross(vc1, v1, v2); |
| 436 |
ok1 = normalize(vc1) != 0.0; |
| 437 |
fvsum(v1, vlist[p2i[0]], vlist[p3i[0]], -1.0); |
| 438 |
fvsum(v2, vlist[p1i[0]], vlist[p3i[0]], -1.0); |
| 439 |
fcross(vc2, v1, v2); |
| 440 |
ok2 = normalize(vc2) != 0.0; |
| 441 |
if (!(ok1 | ok2)) |
| 442 |
return(0); |
| 443 |
/* compute normal interpolation */ |
| 444 |
axis = norminterp(norm, p0i, p1i, p2i, p3i); |
| 445 |
|
| 446 |
/* put out quadrilateral? */ |
| 447 |
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
| 448 |
printf("\n%s ", matname); |
| 449 |
if (axis != -1) { |
| 450 |
printf("texfunc %s\n", TEXNAME); |
| 451 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 452 |
printf("0\n13\t%d\n", axis); |
| 453 |
pvect(norm[0]); |
| 454 |
pvect(norm[1]); |
| 455 |
pvect(norm[2]); |
| 456 |
fvsum(v1, norm[3], vc1, -0.5); |
| 457 |
fvsum(v1, v1, vc2, -0.5); |
| 458 |
pvect(v1); |
| 459 |
printf("\n%s ", TEXNAME); |
| 460 |
} |
| 461 |
printf("polygon %s.%d\n", objname, ++nfaces); |
| 462 |
printf("0\n0\n12\n"); |
| 463 |
pvect(vlist[p0i[0]]); |
| 464 |
pvect(vlist[p1i[0]]); |
| 465 |
pvect(vlist[p3i[0]]); |
| 466 |
pvect(vlist[p2i[0]]); |
| 467 |
return(1); |
| 468 |
} |
| 469 |
/* put out triangles? */ |
| 470 |
if (ok1) { |
| 471 |
printf("\n%s ", matname); |
| 472 |
if (axis != -1) { |
| 473 |
printf("texfunc %s\n", TEXNAME); |
| 474 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 475 |
printf("0\n13\t%d\n", axis); |
| 476 |
pvect(norm[0]); |
| 477 |
pvect(norm[1]); |
| 478 |
pvect(norm[2]); |
| 479 |
fvsum(v1, norm[3], vc1, -1.0); |
| 480 |
pvect(v1); |
| 481 |
printf("\n%s ", TEXNAME); |
| 482 |
} |
| 483 |
printf("polygon %s.%d\n", objname, ++nfaces); |
| 484 |
printf("0\n0\n9\n"); |
| 485 |
pvect(vlist[p0i[0]]); |
| 486 |
pvect(vlist[p1i[0]]); |
| 487 |
pvect(vlist[p2i[0]]); |
| 488 |
} |
| 489 |
if (ok2) { |
| 490 |
printf("\n%s ", matname); |
| 491 |
if (axis != -1) { |
| 492 |
printf("texfunc %s\n", TEXNAME); |
| 493 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 494 |
printf("0\n13\t%d\n", axis); |
| 495 |
pvect(norm[0]); |
| 496 |
pvect(norm[1]); |
| 497 |
pvect(norm[2]); |
| 498 |
fvsum(v2, norm[3], vc2, -1.0); |
| 499 |
pvect(v2); |
| 500 |
printf("\n%s ", TEXNAME); |
| 501 |
} |
| 502 |
printf("polygon %s.%d\n", objname, ++nfaces); |
| 503 |
printf("0\n0\n9\n"); |
| 504 |
pvect(vlist[p2i[0]]); |
| 505 |
pvect(vlist[p1i[0]]); |
| 506 |
pvect(vlist[p3i[0]]); |
| 507 |
} |
| 508 |
return(1); |
| 509 |
} |
| 510 |
|
| 511 |
|
| 512 |
int |
| 513 |
norminterp(resmat, p0i, p1i, p2i, p3i) /* compute normal interpolation */ |
| 514 |
register FVECT resmat[4]; |
| 515 |
register VNDX p0i, p1i, p2i, p3i; |
| 516 |
{ |
| 517 |
#define u ((ax+1)%3) |
| 518 |
#define v ((ax+2)%3) |
| 519 |
|
| 520 |
register int ax; |
| 521 |
MAT4 eqnmat; |
| 522 |
FVECT v1; |
| 523 |
register int i, j; |
| 524 |
|
| 525 |
if (!(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0)) |
| 526 |
return(-1); |
| 527 |
/* find dominant axis */ |
| 528 |
VCOPY(v1, vnlist[p0i[2]]); |
| 529 |
fvsum(v1, v1, vnlist[p1i[2]], 1.0); |
| 530 |
fvsum(v1, v1, vnlist[p2i[2]], 1.0); |
| 531 |
fvsum(v1, v1, vnlist[p3i[2]], 1.0); |
| 532 |
ax = ABS(v1[0]) > ABS(v1[1]) ? 0 : 1; |
| 533 |
ax = ABS(v1[ax]) > ABS(v1[2]) ? ax : 2; |
| 534 |
/* assign equation matrix */ |
| 535 |
eqnmat[0][0] = vlist[p0i[0]][u]*vlist[p0i[0]][v]; |
| 536 |
eqnmat[0][1] = vlist[p0i[0]][u]; |
| 537 |
eqnmat[0][2] = vlist[p0i[0]][v]; |
| 538 |
eqnmat[0][3] = 1.0; |
| 539 |
eqnmat[1][0] = vlist[p1i[0]][u]*vlist[p1i[0]][v]; |
| 540 |
eqnmat[1][1] = vlist[p1i[0]][u]; |
| 541 |
eqnmat[1][2] = vlist[p1i[0]][v]; |
| 542 |
eqnmat[1][3] = 1.0; |
| 543 |
eqnmat[2][0] = vlist[p2i[0]][u]*vlist[p2i[0]][v]; |
| 544 |
eqnmat[2][1] = vlist[p2i[0]][u]; |
| 545 |
eqnmat[2][2] = vlist[p2i[0]][v]; |
| 546 |
eqnmat[2][3] = 1.0; |
| 547 |
eqnmat[3][0] = vlist[p3i[0]][u]*vlist[p3i[0]][v]; |
| 548 |
eqnmat[3][1] = vlist[p3i[0]][u]; |
| 549 |
eqnmat[3][2] = vlist[p3i[0]][v]; |
| 550 |
eqnmat[3][3] = 1.0; |
| 551 |
/* invert matrix (solve system) */ |
| 552 |
if (!invmat4(eqnmat, eqnmat)) |
| 553 |
return(-1); /* no solution */ |
| 554 |
/* compute result matrix */ |
| 555 |
for (j = 0; j < 4; j++) |
| 556 |
for (i = 0; i < 3; i++) |
| 557 |
resmat[j][i] = eqnmat[j][0]*vnlist[p0i[2]][i] + |
| 558 |
eqnmat[j][1]*vnlist[p1i[2]][i] + |
| 559 |
eqnmat[j][2]*vnlist[p2i[2]][i] + |
| 560 |
eqnmat[j][3]*vnlist[p3i[2]][i]; |
| 561 |
return(ax); |
| 562 |
|
| 563 |
#undef u |
| 564 |
#undef v |
| 565 |
} |
| 566 |
|
| 567 |
|
| 568 |
freeverts() /* free all vertices */ |
| 569 |
{ |
| 570 |
if (nvs) { |
| 571 |
free((char *)vlist); |
| 572 |
nvs = 0; |
| 573 |
} |
| 574 |
if (nvts) { |
| 575 |
free((char *)vtlist); |
| 576 |
nvts = 0; |
| 577 |
} |
| 578 |
if (nvns) { |
| 579 |
free((char *)vnlist); |
| 580 |
nvns = 0; |
| 581 |
} |
| 582 |
} |
| 583 |
|
| 584 |
|
| 585 |
int |
| 586 |
newv(x, y, z) /* create a new vertex */ |
| 587 |
double x, y, z; |
| 588 |
{ |
| 589 |
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
| 590 |
if (nvs == 0) |
| 591 |
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 592 |
else |
| 593 |
vlist = (FVECT *)realloc((char *)vlist, |
| 594 |
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
| 595 |
if (vlist == NULL) { |
| 596 |
fprintf(stderr, |
| 597 |
"Out of memory while allocating vertex %d\n", nvs); |
| 598 |
exit(1); |
| 599 |
} |
| 600 |
} |
| 601 |
/* assign new vertex */ |
| 602 |
vlist[nvs][0] = x; |
| 603 |
vlist[nvs][1] = y; |
| 604 |
vlist[nvs][2] = z; |
| 605 |
return(++nvs); |
| 606 |
} |
| 607 |
|
| 608 |
|
| 609 |
int |
| 610 |
newvn(x, y, z) /* create a new vertex normal */ |
| 611 |
double x, y, z; |
| 612 |
{ |
| 613 |
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
| 614 |
if (nvns == 0) |
| 615 |
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 616 |
else |
| 617 |
vnlist = (FVECT *)realloc((char *)vnlist, |
| 618 |
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
| 619 |
if (vnlist == NULL) { |
| 620 |
fprintf(stderr, |
| 621 |
"Out of memory while allocating normal %d\n", nvns); |
| 622 |
exit(1); |
| 623 |
} |
| 624 |
} |
| 625 |
/* assign new normal */ |
| 626 |
vnlist[nvns][0] = x; |
| 627 |
vnlist[nvns][1] = y; |
| 628 |
vnlist[nvns][2] = z; |
| 629 |
if (normalize(vnlist[nvns]) == 0.0) |
| 630 |
return(0); |
| 631 |
return(++nvns); |
| 632 |
} |
| 633 |
|
| 634 |
|
| 635 |
int |
| 636 |
newvt(x, y) /* create a new texture vertex */ |
| 637 |
double x, y; |
| 638 |
{ |
| 639 |
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
| 640 |
if (nvts == 0) |
| 641 |
vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
| 642 |
else |
| 643 |
vtlist = (FLOAT (*)[2])realloc((char *)vtlist, |
| 644 |
(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
| 645 |
if (vtlist == NULL) { |
| 646 |
fprintf(stderr, |
| 647 |
"Out of memory while allocating texture vertex %d\n", |
| 648 |
nvts); |
| 649 |
exit(1); |
| 650 |
} |
| 651 |
} |
| 652 |
/* assign new texture vertex */ |
| 653 |
vtlist[nvts][0] = x; |
| 654 |
vtlist[nvts][1] = y; |
| 655 |
return(++nvts); |
| 656 |
} |
| 657 |
|
| 658 |
|
| 659 |
syntax(fn, ln, er) /* report syntax error and exit */ |
| 660 |
char *fn; |
| 661 |
int ln; |
| 662 |
char *er; |
| 663 |
{ |
| 664 |
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n", |
| 665 |
fn, ln, er); |
| 666 |
exit(1); |
| 667 |
} |
